Clin Exp Otorhinolaryngol.  2024 Aug;17(3):217-225. 10.21053/ceo.2024.00034.

Positional Obstructive Sleep Apnea and Periodic Limb Movements During Sleep: A Large Multicenter Study

• Soh JH
• Kang YJ
• Yoon WH
• Park CS
• Shin HW

• KMID: 2558838
• DOI: http://doi.org/10.21053/ceo.2024.00034

Abstract

Objectives
. The relationships among positional obstructive sleep apnea (POSA), obstructive sleep apnea (OSA), and periodic limb movements during sleep (PLMS) remain unclear. We investigated these relationships with respect to the severity of OSA and explored the underlying mechanisms.
Methods
. We retrospectively reviewed 6,140 eligible participants who underwent full-night diagnostic polysomnography at four clinical centers over a 5-year period, utilizing event-synchronized analysis. We evaluated the periodic limb movement index (PLMI) and the periodic limb movement with arousal index (PLMAI). The impacts of POSA on the PLMI, PLMAI, and PLMS were analyzed in relation to the severity of OSA.
Results
. The mean PLMI, the mean PLMAI, and the prevalence of PLMS were significantly lower in participants with severe OSA compared to the mild and moderate OSA groups. The mean PLMI among those with mild OSA exceeded that of control participants. Furthermore, the mean PLMI (4.8±12.7 vs. 2.6±9.8 events/hr, P<0.001), the mean PLMAI (0.9±3.7 vs. 0.5±3.3 events/hr, P<0.001), and the prevalence of PLMS (11% vs. 5.3%, P<0.001) were higher in patients with POSA than in those with non-positional OSA. This PLMS finding was particularly pronounced among those with severe OSA (odds ratio [OR], 1.554; 95% confidence interval [CI], 1.065–2.267) and was less evident in the mild (OR, 0.559; 95% CI, 0.303–1.030) and moderate (OR, 1.822; 95% CI, 0.995–3.339) groups.
Conclusion
. Patients with POSA, especially those with severe OSA, exhibit a comparatively high prevalence of PLMS. In cases involving prominent PLMS, the diagnosis and treatment of POSA and OSA should be considered.

Keyword

Obstructive Sleep Apnea; Sleep Apnea Syndromes; Periodic Limb Movement Disorder; Excessive Sleep-Related Periodic Leg Movements; Supine Position

Figure

• 

  Fig. 1. Study flowchart. BMI, body mass index; AHI, apnea–hypopnea index; PLMI, periodic limb movement index; OSA, obstructive sleep apnea; PLMS, periodic limb movements during sleep; POSA, positional obstructive sleep apnea.

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